package/sysvinit: comment out login line in inittab if getty is disabled

package/sysvinit: comment out login line in inittab if getty is disabled

When the "Run a getty" option is disabled, sysvinit doesn't remove the
/etc/inittab line from previous builds. With this patch, the line is
correctly commented out.

Based on similar change made by Stephen Bos <stephen.bos@hagergroup.com>
and Christophe Blaess <christophe.blaess@logilin.fr> for busybox.

Signed-off-by: Carlos Santos <unixmania@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>